Road planer



March 9, 1937. e. R. wlLcox 2,072,995

ROAD PLANER Filed May 11, 1936 IN VENTOR GEORGE R.WILCOX A TTORN rs Patented Mar. 9, 1937 UNITED STATES PATENT OFFICE ROAD PLANER Application May 11, 1936, Serial No. 79,112

3 Claims.

The invention relates to road graders or planers of the type shown in the patents to Price Nos. 1,840,820, 1,865,587 and 1,932,601, and the invention relates to improved constructions as 5 hereinafter set forth.

Machines of the type above referred to comprise essentially a truck or motor driven vehicle to which is attached a transversely extending beam rotatively secured to segmental guides which permit of adjustment to different angles in relation to the direction of movement of the vehicle. Mounted in suitable bearings upon this beam is a shaft to which is secured the road planer or blades. This shaft is rockable in its bearings to swing the blade into different positions of angular adjustment and pneumatic operating means is also provided for effecting this rocking movement. Thus in use, the operator by applying the pneumatic pressure can yieldably hold the blade against the road bed so that it will effect the planing operation, but in case of meeting any obstruction that cannot be removed the blade will ride over the same being forced upward against a pneumatic pressure.

Machines such as just described, can be successfully used in planing ordinary road beds of fairly uniform hardness. If, however, there are soft spots there is a tendency for the blade to dig and to form a hollow or depressed portion in the road. To overcome this dim culty I have devised a construction in which the blade while free to move upward against the resilient pressure, is positively stopped from moving downward beyond a predetermined point. The specific construction is shown in the accompanying drawing in which:

Figure l is a perspective view of a portion of a road planer;

Figure 2 is a cross-section thereof.

A is the cross beam which as shown is of inverted channel cross-section. B is a shaft preferably a tube, journaled in suitable bearings C secured to the underside of the channel. D is a blade supporting arm mounted on the shaft B. 45 E is a pneumatic motor the cylinder of which is pivotally attached at its upper end to a bracket F mounted on the beam A. The piston rod G extends downward and is pivotally connected at H to an arm 1-11 on the shaft B. I is the blade 50 secured to the arms D and yieldably pressed downward by the pneumatic pressure in the cylinder E.

To limit the downward movement of the blade I to some predetermined point I have provided a stop for the rotation of the shaft B in one direction. This preferably consists of a stop shoulder on the shaft B which asshown comprises a.

split collar J, clamped upon the shaft by the bolts K. The section J has an eccentric portion J which extends upward into the channel of the beam A. L is a screw engaging a threaded aperture in the web of the channel beam and located to be in the path of the eccentric portion J of the collar J. This screw may be adjusted to different positions and then looked in this position by a nut L. Thus in use, the operator adjusts the screw L to determine the lowermost position of the blade I looking it in this position by the nut L. The machine may then be used for planing the road and if a soft spot is encountered the blade is prevented from digging therein below the predetermined level.

What I claim as my invention is:

1. In a road planer, the combination with a rockshaft, a scraper blade mounted on said rockshaft and resilient means for rocking the shaft in a direction to press the blade against the road bed, of an adjustable stop for limiting the rocking movement of said shaft.

2. In a road planer, the combination with a cross beam, a rockshaft journaled in hearings on said beam, rock arms mounted on said rockshaft, a scraper blade carried by said rock arms and a pneumatic motor for yieldably rocking said shaft in the direction to press the blade against the road bed, of an eccentric bearing secured to said rcckshaft and a screw adjustably engaging said beam and extending into the path of said eccentric bearing.

3. In a road planer, the combination with a cross beam of inverted channel section, a rockshaft, journal bearings for said rockshaft secured to said beam, rock arms mounted on said rockshaft, a scraper blade carried by said rock arms and a pneumatic motor for yieldably rocking said shaft in the direction to press said blade against the road bed, of a split collar clamped upon said shaft said collar having an eccentric portion extending into the channel of said beam and a screw adjustably engaging a threaded bearing in the web of said channel and extending into the path of said eccentric bearing to form an adjustable stop for limiting downward movement of the planer.

GEORGE R. WILCO'X. 

